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    OPTICAL WAVELENGTH CONVERTING ELEMENT AND METHOD FOR MANUFACTURING THE SAME
    2.
    发明专利
    OPTICAL WAVELENGTH CONVERTING ELEMENT AND METHOD FOR MANUFACTURING THE SAME 失效

    公开(公告)号：JP2002196381A

    公开(公告)日：2002-07-12

    申请号：JP2000391214

    申请日：2000-12-22

    Applicant: MATSUSHITA ELECTRIC IND CO LTD ,  NAT INST FOR MATERIALS SCIENCE ,  KITAMURA KENJI ,  FURUKAWA YASUNORI ,  TAKEGAWA SHUNJI ,  NAKAMURA MASARU

    Inventor： MIZUUCHI KIMINORI ,  YAMAMOTO KAZUHISA ,  KITAMURA KENJI ,  FURUKAWA YASUNORI ,  TAKEGAWA SHUNJI ,  NAKAMURA MASARU

    IPC: G02F1/377

    Abstract: PROBLEM TO BE SOLVED: To provide a high-efficiency structure of an optical wavelength converting element in which inhomogeneity in the polarization inversion structure due to processes of forming an optical waveguide is prevented by repeating part of the periodical polarization inversion structure formed in a stoichiometric LN crystal to stabilize the structure. SOLUTION: The optical wavelength converting element has a stoichiometric LiNbO3 crystal substrate 1 having 49.5 to 50.2% molar ratio of Li2O/(Nb2O5+Li2 O) and a polarization inversion part 2 formed on the surface of the crystal. The polarization inversion part 2 is periodically arranged, at least part of which being formed in contact with each other by repetition. A comb-like electrode is formed on the surface of the substrate 1, a flat electrode is formed on the back face of the substrate and a voltage is applied between the electrodes to grow the polarization inversion from the comb-like electrode. The polarization inversed part and its continuous part are formed inward in the crystal. Then a proton exchange optical waveguide 3 is formed by proton exchanging and annealing.

    CRUCIBLE AND APPARATUS FOR PRODUCING SINGLE CRYSTAL, AND METHOD OF PRODUCING SINGLE CRYSTAL USING THE SAME
    8.
    发明专利
    CRUCIBLE AND APPARATUS FOR PRODUCING SINGLE CRYSTAL, AND METHOD OF PRODUCING SINGLE CRYSTAL USING THE SAME 失效

    公开(公告)号：JP2002060296A

    公开(公告)日：2002-02-26

    申请号：JP2000250292

    申请日：2000-08-21

    Applicant: CRYSTAL SYSTEM KK ,  NAT INST FOR MATERIALS SCIENCE ,  FURUYA KINZOKU KK

    Inventor： SHINDO ISAMU ,  KITAMURA KENJI ,  TAKEGAWA SHUNJI ,  FURUKAWA YASUNORI ,  NAKAMURA MASARU ,  FURUYA AKITAMI

    IPC: C30B15/10

    Abstract: PROBLEM TO BE SOLVED: To provide a crucible and an apparatus for producing a single crystal, capable of independently controlling the temperatures of a melting tank and a growing tank and realizing the temperature distribution at the inside of the growing tank, providing a heat convection ideal for a pulling method and with which a large scale single crystal having a uniform composition and a prescribed target diameter can be produced, and to provide a method of producing the same using the same. SOLUTION: In the crucible for producing the single crystal, the melting tank is connected to the outside, from the middle of the side wall of the growing tank and communicatable flow holes are formed in the sidewall of the growing tank so that molten liquid can flow in or out between the inside of the melting tank and the inside of the growing tank. The single crystal can be obtained by supplying a powdery raw material into the melting tank of the crucible, mentioned above, for producing the single crystal, then melting the raw material, dipping a seed crystal into a melt flowing-in from the melting tank and pulling up the single crystal while growing the single crystal.

    OPTICAL FUNCTIONAI, ELEMENT USING FERROELECTRIC POLARIZATION INVERSION OF LITHIUM TANTALATE
    9.
    发明专利
    OPTICAL FUNCTIONAI, ELEMENT USING FERROELECTRIC POLARIZATION INVERSION OF LITHIUM TANTALATE 失效

    公开(公告)号：JP2002072266A

    公开(公告)日：2002-03-12

    申请号：JP2000255102

    申请日：2000-08-25

    Applicant: NAT INST FOR MATERIALS SCIENCE ,  FURUKAWA YASUNORI ,  KITAMURA KENJI ,  TAKEGAWA SHUNJI

    Inventor： FURUKAWA YASUNORI ,  KITAMURA KENJI ,  TAKEGAWA SHUNJI

    IPC: G02F1/03 ,  G02B1/02 ,  G02F1/29 ,  G02F1/355 ,  G02F1/37 ,  G02F1/39

    Abstract: PROBLEM TO BE SOLVED: To provide an optical functional element in which the controllability of a polarization inversion structure is improved and the resistance against optical damage is further improved. SOLUTION: The following optical elements (1) to (3) or the like can be realized by using a single crystal of lithium tantalate having nearly a stoichiometric composition with excess Li and 0.500 to 0.505 mole fraction of Li2O/(Ta2O5+Li2O) for the substrate. The elements are (1) an optical functional element which converts the wavelength of incident laser light having the wavelength in the visible to near IR region into shorter or longer wavelength by periodically reversing the polarization structure of the lithium tantalite single crystal, (2) an optical memory element or optical circuit element to record various kinds of information in the single crystal by forming polarization reversal in a minute region in the lithium tantalate single crystal in a single polarization state, and (3) an optical element which controls the laser light incident to the single crystal by using the electro-optical effect of the single crystal and which deviates, focuses or switches the light by using the large change in the refractive index in the reversal structure of the ferroelectric polarization of the lithium tantalite single crystal.

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